Digi NS9750 Benutzerhandbuch
S t a t i c m e m o r y c o n t r o l l e r
1 6 0
N S 9 7 5 0 H a r d w a r e R e f e r e n c e
Byte
000
01
--
1011
-
[23:16]
-
-
Byte
000
00
--
0111
[31:24]
-
-
-
Access: Write, big endian, 8-bit external
bus
bus
System data mapping on to external
databus
databus
Internal
transfer
width
transfer
width
DATA to HRDATA
HSIZE
[2:0]
[2:0]
HADD
R [1:0]
R [1:0]
ADDROUT
[1:0]
[1:0]
BLSOU
T [0]
T [0]
[31:24]
[23:16]
[15:8]
[7:0]
Word (4
transfers
transfers
010
--
11
10
01
00
0
0
0
0
-
-
-
-
-
-
-
-
-
-
-
-
[7:0]
[15:8]
[23:16]
[31:24]
Halfword (2
transfers)
transfers)
001
1-
11
10
0
0
-
-
-
-
-
-
[7:0]
[15:8]
Halfword (2
transfers)
transfers)
001
0-
01
00
0
0
-
-
-
-
-
-
[23:16]
[31:24]
Byte
000
11
11
0
-
-
-
[7:0]
Byte
000
10
10
0
-
-
-
[15:8]
Byte
000
01
01
0
-
-
-
[23:16]
Byte
000
00
00
0
-
-
-
[31:24]
Table 88: Big endian write, 8-bit external bus
Access: Read, big endian, 32-bit external
bus
bus
External data mapping on to system
databus
databus
Internal
transfer
width
transfer
width
HRDATA to DATA
HSIZE
[2:0]
[2:0]
HADDR
[2:1]
[2:1]
ADDROUT
[1:0]
[1:0]
BLSOU
T [3:0]
T [3:0]
[31:24]
23:16]
[15:8]
[7:0]
Table 87: Big endian read, 32-bit external bus